Method for representing optotypes, optotype representation, associated use and image output device

Abstract

Method for optotype representation (2) via an image output device (4) for a visual acuity test and / or determination of a refraction, with optotypes (10) being displayed in a three-dimensional image (6) and an image separation occurring in such a way that the optotypes (10) are monocularly discernible in binocular conditions, wherein the three-dimensional image (6) is binocularly discernible.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The invention concerns a method for optotype representation via an image output device for a visual acuity test and / or the determination of a refraction. The invention also concerns a respective optotype representation, an image output device and the use of an optotype representation.2. Brief Description of Related Art[0002]In order to investigate refraction or the visual acuity of human eyes, usually first the first eye is tested while the second eye is covered. Then the second eye is tested while the first eye is covered. This procedure takes a relatively long time, and in addition, the test person's eyes suffer from fatigue during the eyesight test procedure, which may result in measuring errors. In this so-called monocular eye test, zyclophorous (rolling) eyes may occur which then lead to erroneous cylinder values.SUMMARY OF THE INVENTION[0003]The invention has the purpose of remedying the disadvantages of the state of th...

AI Technical Summary

Benefits of technology

[0004]The fact that provisions are made for both eyes perceiving a three-dimensional binocular image at the same time, but only one eye monocularly discerns the respective optotype effectively prevents eye fatigue and the resulting erroneous test result since relaxed, natural vision is made possible. The entire visual apparatus of the human being including its highest developed form, three-dimensional, stereoscopic vision, is addressed and natural vision during an eyesight test is allowed as much as possible. This allows particularly advantageous eyesight tests and thus eventually glasses with a correction that is particularly advantageous for spectacle wearers. It is furthermore no longer necessary to interrupt binocular vision by a covering plate or similar in order to conduct a monocular eyesight test. Instead, both eyes always see during the entire eyesight test procedure, while at the same time the optotypes are discernible monocularly. Thus, all necessary functions of a pair of eyes can be tested binocularly under monocular arrangement, with the disadvantages of monocular eyesight tests, especially eye fatigue and unnatural vision with just one eye are effectively avoided, which leads to more exact and agreeable spectacle corrections. The image output device may also be a 3D monitor or a 3D TV. Such an image output device allows an optotype representation in a particularly simple manner since it is not necessary, for example for an optician, to buy expensive special instruments for conducting eyesight tests. It is also conceivable that filters with circulating polarization or shutter glasses are used for image separation. Especially in cases in which the image output device is a 3D TV, this allows provision of a particularly easy and cost-effective method for optotype representation. In passive 3D technology, for example, the 3D effect is achieved by linear circular polarization, with 3D glasses being used for image separation.

[0005]It is advantageous if the three-dimensional image extends to the vertical edges of the image and / or the image output device. This allows provision of a peripheral fusion stimulus by a three-dimensional image being displayed on the entire width of the image output device, which means further approximation of natural, stereoscopic vision.

[0006]It is conceivable that the optotypes are arranged in a horizontal line. It is furthermore also conceivable that several such lines are arranged vertically one on top of another. This especially allows conducting eyesight tests that use several optotypes. Furthermore, this allows conducting several eyesight tests with just one optotype representation.

[0011]Preferably, the optotype representation used displays optotypes in a horizontal line in such a way that three different visual tests can be conducted. A first and a second of the three eyesight tests may be a screening of contrast sensitivity and cylinder refraction. This allows checking the functions of the pair of eyes in a particularly short time binocularly with a monocular assignment. It has proven particularly advantageous if the optotype representation is used in a stereo test. The optotypes are stereoscopically perceived during the eyesight test and may, for example, also be arranged in a certain stereo angle.

[0015]The invention has the purpose of providing a method for refraction determination that avoids measuring errors due to eye fatigue and due to a zyclophorous eye condition.

[0016]Optotypes in a three-dimensional environment are shown on a 3D monitor or 3D TV device with circular polarization. Filters with circular polarization are used that allow simultaneous monocular vision of the eyes in binocular conditions. The new element of this method is that the entire visual organ sees a 3D image in the background, but the respective optotype is only presented to one eye. This allows addressing the complete visual organ of the human being including its highest developed form, stereoscopic vision, and natural, complete vision is demanded. This obtains a refraction result that corresponds to normal, natural vision. In this process, both eyes of the test person remain open from the beginning. This refraction option allows particularly precise corrections that are especially necessary for compatible spectacle corrections, especially for comfortable varifocal glasses. The advantage of this method is that all the necessary functions of the pair of eyes are tested binocularly with monocular assignment in a very short time.

Problems solved by technology

This procedure takes a relatively long time, and in addition, the test person's eyes suffer from fatigue during the eyesight test procedure, which may result in measuring errors.

In this so-called monocular eye test, zyclophorous (rolling) eyes may occur which then lead to erroneous cylinder values.

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